US2863034A - Electric resistance element - Google Patents
Electric resistance element Download PDFInfo
- Publication number
- US2863034A US2863034A US507381A US50738155A US2863034A US 2863034 A US2863034 A US 2863034A US 507381 A US507381 A US 507381A US 50738155 A US50738155 A US 50738155A US 2863034 A US2863034 A US 2863034A
- Authority
- US
- United States
- Prior art keywords
- electric resistance
- resistance element
- rod
- rods
- groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
- H01C17/06—Apparatus or processes specially adapted for manufacturing resistors adapted for coating resistive material on a base
- H01C17/075—Apparatus or processes specially adapted for manufacturing resistors adapted for coating resistive material on a base by thin film techniques
- H01C17/08—Apparatus or processes specially adapted for manufacturing resistors adapted for coating resistive material on a base by thin film techniques by vapour deposition
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
- H01C1/144—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors the terminals or tapping points being welded or soldered
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49082—Resistor making
- Y10T29/49099—Coating resistive material on a base
Definitions
- Luigi Tassara United States Patent ELECTRIC RESISTANCE ELEMENT Luigi Tassara, Milan, Italy Application May 10, 1955, Serial No. 507,381 Claims priority, application Italy May 10, 1954 4 Claims. (Cl. 201-63)
- the present invention relates to a process for the production of electric resistors by means of deposition of metal by vaporization under vacuo, as well as to resistors so obtained.
- the process is characterized in that at first a series of rods of steatite or the like is produced by drawing, which are provided with at least one longitudinal groove, the ends of said rods are covered with a conductive substance to which the terminal conductors are fixed, and then a metallic layer (metallic salts and oxides) is made to deposit by vaporization under vacuo in said longitudinal groove of said rods, while checking at the terminal conductors whether the desired value of electric resistance is attained.
- a series of rods of steatite or the like is produced by drawing, which are provided with at least one longitudinal groove, the ends of said rods are covered with a conductive substance to which the terminal conductors are fixed, and then a metallic layer (metallic salts and oxides) is made to deposit by vaporization under vacuo in said longitudinal groove of said rods, while checking at the terminal conductors whether the desired value of electric resistance is attained.
- Fig. 1 is a perspective view of a drawn rod
- Fig. 2 illustrates the same rod after application of the: coverings of the ends and of the terminal conductors;
- Fig. 3 illustrates the arrangement of a series of small. rods according to Fig. 2 on a rotating disc during thedeposition of the metal which constitutes the electric: resistor proper;
- Fig. 4 is a section along the line IVIV of Fig. 3;
- Fig. 5 illustrates the resistor obtained with the process according to the invention.
- Fig. 6 represents the small rod after the application of the coverings at its ends, in a variant.
- Procedure is as follows: First a continuous bar is produced of steatite or the like material which is cut to sections of equal length in such a way as to form a num 'ber of small rods (one of which is illustrated in Fig. 1) provided with an axal hole 1 and with two longitudinal. grooves 2, 2. Then the ends of said rods are dipped into- :a bath of silver or other metallic substance, the two me-- tallic terminals 3, 4, are fitted into the ends of the axial. -hole 1 and said terminals are welded to the coverings. .5, 6, obtained by the above-mentioned dipping. The rods thus'assume the appearance illustrated in Fig. 2.
- Fig. 3 in correspondence with a series of slots 8 in said. 'disc.
- Fig. 4 illustrates particularly the fact that the: groove 2 of the small rods comes to close at top the slots 8 of the disc.
- the metallic vapours coming from the lower part of the disc deposit on the groove 2 and with their deposition make the electric resistance decrease con- Patented Dec. 2, 1958 tinuously between the terminals 3 and 4.
- the finished resistor assumes the appearance shown in Fig. 5 (9 designating the metallic layer deposited by vacuum vaporization).
- Fig. 6 illustrates a variant and it will be noted therein that the covering at the ends is limited to the ends of the longitudinal grooves 2--2' and to a strip of the heads which connects said ends and which comprises the hole for fastening the terminal conductors.
- a further advantage is due to the effective protection of the resistor layer deposited in the groove; this protection is obtained mechanically by the shape of the said groove and chemically by a slight layer of quartz, important for the protection against oxidation as produced by temperature, said quartz layer being deposited under vacuo subsequent to the metal layer.
- An electric resistance element comprising a rod of insulating material having at least one longitudinal groove in the surface thereof, conductive coatings on the opposite end portions of said rod, terminal conductors extending from said conductive coatings, and a layer of metal in said groove extending between said conductive coatings and determining the electric resistance of the element.
- An electric resistance element comprising a rod of insulating material having at least one longitudinal groove in the surface thereof and a longitudinal hole opening at the opposite ends of said rod, conductive coatings on the opposite end portions of said rods, terminal conductors extending into the opposite ends of said hole and welded tothe adjacent conductive coatings, and a layer of metal in said groove extending between said conductive coatings and determining the electric resistance of the element.
Description
Dec. 2, 1958 "1" 1 gr I Iiill IIIIIIIIIIIIIII L. TASSARA I ELECTRIC RESISTANCE ELEMENT Filed May 10, 1955 1/ lllll ll INVENTOR.
Luigi Tassara United States Patent ELECTRIC RESISTANCE ELEMENT Luigi Tassara, Milan, Italy Application May 10, 1955, Serial No. 507,381 Claims priority, application Italy May 10, 1954 4 Claims. (Cl. 201-63) The present invention relates to a process for the production of electric resistors by means of deposition of metal by vaporization under vacuo, as well as to resistors so obtained.
The process is characterized in that at first a series of rods of steatite or the like is produced by drawing, which are provided with at least one longitudinal groove, the ends of said rods are covered with a conductive substance to which the terminal conductors are fixed, and then a metallic layer (metallic salts and oxides) is made to deposit by vaporization under vacuo in said longitudinal groove of said rods, while checking at the terminal conductors whether the desired value of electric resistance is attained.
Now a preferred mode of operation will be described by way of example without limitation, to obtain a series of electric resistors according to the invention.
The accompanying drawings illustrate some stages of said process and the resistors obtained therewith. In said drawings:
Fig. 1 is a perspective view of a drawn rod;
Fig. 2 illustrates the same rod after application of the: coverings of the ends and of the terminal conductors;
Fig. 3 illustrates the arrangement of a series of small. rods according to Fig. 2 on a rotating disc during thedeposition of the metal which constitutes the electric: resistor proper;
Fig. 4 is a section along the line IVIV of Fig. 3;
Fig. 5 illustrates the resistor obtained with the process according to the invention; and
Fig. 6 represents the small rod after the application of the coverings at its ends, in a variant.
Procedure is as follows: First a continuous bar is produced of steatite or the like material which is cut to sections of equal length in such a way as to form a num 'ber of small rods (one of which is illustrated in Fig. 1) provided with an axal hole 1 and with two longitudinal. grooves 2, 2. Then the ends of said rods are dipped into- :a bath of silver or other metallic substance, the two me-- tallic terminals 3, 4, are fitted into the ends of the axial. -hole 1 and said terminals are welded to the coverings. .5, 6, obtained by the above-mentioned dipping. The rods thus'assume the appearance illustrated in Fig. 2.
Then said small rods are arranged on a rotary disc 7' (Fig. 3 in correspondence with a series of slots 8 in said. 'disc). Fig. 4 illustrates particularly the fact that the: groove 2 of the small rods comes to close at top the slots 8 of the disc. The metallic vapours coming from the lower part of the disc deposit on the groove 2 and with their deposition make the electric resistance decrease con- Patented Dec. 2, 1958 tinuously between the terminals 3 and 4. During this stage of vaporization under vacuo it is possible to check the time at which the electric resistance of the deposit layer reaches the desired value. The finished resistor assumes the appearance shown in Fig. 5 (9 designating the metallic layer deposited by vacuum vaporization).
Fig. 6 illustrates a variant and it will be noted therein that the covering at the ends is limited to the ends of the longitudinal grooves 2--2' and to a strip of the heads which connects said ends and which comprises the hole for fastening the terminal conductors.
The advantages of the invention are due to the great simplicity of structure and manufacture, to the. considerable mechanical strength and to the perfect gauging of the resistance value.
A further advantage is due to the effective protection of the resistor layer deposited in the groove; this protection is obtained mechanically by the shape of the said groove and chemically by a slight layer of quartz, important for the protection against oxidation as produced by temperature, said quartz layer being deposited under vacuo subsequent to the metal layer.
I claim:
1. An electric resistance element comprising a rod of insulating material having at least one longitudinal groove in the surface thereof, conductive coatings on the opposite end portions of said rod, terminal conductors extending from said conductive coatings, and a layer of metal in said groove extending between said conductive coatings and determining the electric resistance of the element.
2. An electric resistance element comprising a rod of insulating material having at least one longitudinal groove in the surface thereof and a longitudinal hole opening at the opposite ends of said rod, conductive coatings on the opposite end portions of said rods, terminal conductors extending into the opposite ends of said hole and welded tothe adjacent conductive coatings, and a layer of metal in said groove extending between said conductive coatings and determining the electric resistance of the element.
3. An electric resistance element as in claim 2; wherein said rod has two longitudinal grooves at diametrically opposed locations, and said conductive coatings at the opposite ends of the rod are confined to the opposite end portions of said two grooves and to stripes on the opposite end faces of the rod connecting the adjacent ends of said grooves.
4. An electric resistance element as in claim 2; wherein said conductive coatings completely cover the opposite end portions of said rod.
References Cited in the file of this patent UNITED STATES PATENTS 2,021,509 Hastings Nov. 19, 1935 2,052,533 Pender Aug. 25, 1936 2,061,516 Frese Nov. 17, 1936 2,313,853 Veley Mar. 16, 1943 2,385,702 Hediger et al Sept. 25, 1945 2,476,592 Fruth July 19, 1949 2,487,057 Kohring Nov. 8, 1949 2,629,166 Marsten et al. Feb. 24, 1953 2,721,351 Nitzel et al. Oct. 25, 1955
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT776214X | 1954-05-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2863034A true US2863034A (en) | 1958-12-02 |
Family
ID=11316265
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US507381A Expired - Lifetime US2863034A (en) | 1954-05-10 | 1955-05-10 | Electric resistance element |
Country Status (3)
Country | Link |
---|---|
US (1) | US2863034A (en) |
FR (1) | FR1133868A (en) |
GB (1) | GB776214A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2937354A (en) * | 1957-08-02 | 1960-05-17 | Bendix Aviat Corp | Thermally-sensitive resistor |
US3189482A (en) * | 1961-03-09 | 1965-06-15 | Gen Mills Inc | Metal film resistor and method of its formation |
US3279042A (en) * | 1961-07-20 | 1966-10-18 | Siemens Planiawerke Ag | Method for producing a contact layer on a silicon-containing material |
US3296574A (en) * | 1962-12-21 | 1967-01-03 | Tassara Luigi | Film resistors with multilayer terminals |
DE1299752B (en) * | 1962-08-01 | 1969-07-24 | Standard Elektrik Lorenz Ag | Process for the production of metal film resistors |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2021509A (en) * | 1934-01-09 | 1935-11-19 | Hardwick Hindle Inc | Resistance device and unit therefor |
US2052533A (en) * | 1936-08-25 | Sesistance unit | ||
US2061516A (en) * | 1935-11-20 | 1936-11-17 | Monitor Controller Co | Method of making edgewise wound resistance coils |
US2313853A (en) * | 1943-03-16 | Resistor and method of making the | ||
US2385702A (en) * | 1942-09-24 | 1945-09-25 | Carborundum Co | Electrical resistor |
US2476592A (en) * | 1944-12-13 | 1949-07-19 | Fruth Hal Frederick | Cathodic deposition apparatus |
US2487057A (en) * | 1946-02-23 | 1949-11-08 | Wilbur M Kohring | Resistance unit and method of making same |
US2629166A (en) * | 1948-10-07 | 1953-02-24 | Int Resistance Co | Method of forming resistor assemblies |
US2721351A (en) * | 1953-08-14 | 1955-10-25 | Kenneth E Nitzel | Heated wiper blade |
-
1955
- 1955-05-09 FR FR1133868D patent/FR1133868A/en not_active Expired
- 1955-05-10 GB GB13543/55A patent/GB776214A/en not_active Expired
- 1955-05-10 US US507381A patent/US2863034A/en not_active Expired - Lifetime
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2052533A (en) * | 1936-08-25 | Sesistance unit | ||
US2313853A (en) * | 1943-03-16 | Resistor and method of making the | ||
US2021509A (en) * | 1934-01-09 | 1935-11-19 | Hardwick Hindle Inc | Resistance device and unit therefor |
US2061516A (en) * | 1935-11-20 | 1936-11-17 | Monitor Controller Co | Method of making edgewise wound resistance coils |
US2385702A (en) * | 1942-09-24 | 1945-09-25 | Carborundum Co | Electrical resistor |
US2476592A (en) * | 1944-12-13 | 1949-07-19 | Fruth Hal Frederick | Cathodic deposition apparatus |
US2487057A (en) * | 1946-02-23 | 1949-11-08 | Wilbur M Kohring | Resistance unit and method of making same |
US2629166A (en) * | 1948-10-07 | 1953-02-24 | Int Resistance Co | Method of forming resistor assemblies |
US2721351A (en) * | 1953-08-14 | 1955-10-25 | Kenneth E Nitzel | Heated wiper blade |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2937354A (en) * | 1957-08-02 | 1960-05-17 | Bendix Aviat Corp | Thermally-sensitive resistor |
US3189482A (en) * | 1961-03-09 | 1965-06-15 | Gen Mills Inc | Metal film resistor and method of its formation |
US3279042A (en) * | 1961-07-20 | 1966-10-18 | Siemens Planiawerke Ag | Method for producing a contact layer on a silicon-containing material |
DE1299752B (en) * | 1962-08-01 | 1969-07-24 | Standard Elektrik Lorenz Ag | Process for the production of metal film resistors |
US3296574A (en) * | 1962-12-21 | 1967-01-03 | Tassara Luigi | Film resistors with multilayer terminals |
Also Published As
Publication number | Publication date |
---|---|
FR1133868A (en) | 1957-04-03 |
GB776214A (en) | 1957-06-05 |
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